Ferromagnetic ordering along the hard axis in the Kondo lattice YbIr3Ge7
| Autor: | Dmitry A. Sokolov, Emilia Morosan, Chien-Lung Huang, Julia Y. Chan, D. Hafner, Binod K. Rai, Jacintha Banda, Katherine A. Benavides, Manuel Brando, Macy Stavinoha |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Magnetic order FOS: Physical sciences 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Magnetocrystalline anisotropy 01 natural sciences Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science Ferromagnetism Electric field Lattice (order) Quantum critical point 0103 physical sciences Antiferromagnetism Curie temperature Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.121109 |
| Popis: | Ferromagnetic Kondo lattice compounds are far less common than their antiferromagnetic analogs. In this work, we report the discovery of a new ferromagnetic Kondo lattice compound, YbIr3Ge7. Like almost all ferromagnetic Kondo lattice systems, YbIr3Ge7 shows magnetic order with moments aligned orthogonal to the crystal electric field (CEF) easy axis. YbIr3Ge7 is unique in that it is the only member of this class of compounds that crystallizes in a rhombohedral structure with a trigonal point symmetry of the magnetic site, and it lacks broken inversion symmetry at the local moment site. AC magnetic susceptibility, magnetization, and specific heat measurements show that YbIr3Ge7 has a Kondo temperature TK = 14 K and a Curie temperature TC = 2.4 K. Ferromagnetic order occurs along the crystallographic [100] hard CEF axis despite the large CEF anisotropy of the ground state Kramers doublet with a saturation moment along [001] almost four times larger than the one along [100]. This implies that a mechanism which considers the anisotropy in the exchange interaction to explain the hard axis ordering is unlikely. On the other hand, the broad second-order phase transition at TC favors a fluctuation-induced mechanism. |
| Databáze: | OpenAIRE |
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